Amidst an epidemic scare, Brazil is gearing up for its annual pre-Lenten celebrations. The growing threat of Zika has prompted officials to spray the city's Sambadrome Carnival stadium against disease-bearing mosquitoes. Despite the threat, scantily clad dancers in their bikinis and colorful costumes are focused on final rehearsals. Faiza Elmasry has the story, narrated by Faith Lapidus.